IGBT module online monitoring method

Abstract

The invention provides an IGBT module online monitoring method comprising a to-be-tested IGBT module and at least one test IGBT module. The to-be-tested IGBT module and the at least one test IGBT module constitute a bridge circuit. The aging state of the to-be-tested IGBT module is tested according to the following steps: inputting a short-circuit driving voltage to the to-be-tested IGBT module and making the to-be-tested IGBT module work under saturated current, and inputting a work driving voltage to the test IGBT module to make the test IGBT module work normally; and detecting the short-circuit current value of the to-be-tested IGBT module under saturated current, and judging the aging state of the to-be-tested IGBT module according to the short-circuit current value. The aging state of an IGBT module can be monitored accurately without shutdown or disassembly, so the aging state of the IGBT module can be judged accurately, and economic loss caused by detection in a shutdown state and the influence on the accuracy of measurement caused by IGBT module damage due to disassembly are avoided effectively.

Description

Technical field [0001] The invention relates to a detection method for power equipment, in particular to an online monitoring method for an IGBT module. Background technique [0002] With the global energy crisis and increasingly serious environmental problems, the development of new energy technologies has been promoted. In recent years, power electronic devices have played an increasingly important role in new energy applications, especially in wind power, solar power, electric vehicles, and electronics. The widespread application of lighting and other modern industries has made people pay more and more attention to the reliability research of power electronic systems. [0003] In power electronic devices, IGBT modules are one of the key components of power converters. In industrial applications, more than 20% of converter failures are caused by the aging of IGBT modules, which seriously affects the reliability of power electronic systems. As the IGBT module in the converter inc...

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Problems solved by technology

[0004] The health level of the IGBT module is related to its own parasitic parameters. Therefore, the aging state of the device can be judged by monitoring the changes of the parasitic parameters of the IGBT module, so that a reasonable converter maintenance plan can be formulated. However, the state of the IGBT module in the prior art The monitoring method is relatively complicated, the cost is high, and the IGBT module needs to be shut down or disassembled; the shutdown for maintenance will cause huge economic losses, and the disassembly work will also cause certain damage to the IGBT module, thereby affecting the monitoring accuracy

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